What is a common effect of over-processing hair during chemical treatments?

Over-processing hair during chemical treatments can lead to hair breakage, which is a common and unfortunate consequence of applying too many harsh chemicals or using them too frequently. When hair is exposed to treatments such as bleaching, perming, or relaxing, the chemical bonds within the hair structure are altered. If these treatments are not performed correctly or if the hair is already weakened from previous treatments, the hair can lose its natural moisture and elasticity.

Hair breakage occurs because the structural integrity of the hair is compromised. The outer cuticle layer may become damaged, leading to frizz and split ends, and ultimately causing the hair shaft to become weak and prone to breaking. Maintaining the balance between chemical treatments and proper hair care is essential to avoid over-processing, which ultimately contributes to hair health and appearance.

The other options, such as increased shine and strengthened hair, are generally associated with effectively applied treatments that are within the hair's tolerance levels, while faster growth is influenced by factors unrelated to chemical processes. Therefore, the correct answer highlights a critical understanding of the potential risks involved with chemical hair treatments.